Sheet edge trimming and removal from a structured paper fabric

Abstract

The disclosure relates to a method for trimming unwanted edges from a moving paper web. The disclosure also relates to the trimming of unwanted edges while the web is traveling on a structured papermaking fabric. The method uses a water nozzle having a diameter of 0.02″ or less. The method also includes the removal of the unwanted edge trimmings to a trim chute through the use of moving air, for example, an air knife. The disclosure also relates to an edge trimming apparatus.

We claim: 
     
       1. A method for trimming an unwanted edge from a moving paper web comprising:
 providing the moving paper web in contact with a structured papermaking fabric; 
 cutting the unwanted edge from the web when it is on the structured papermaking fabric with one or more water nozzles; and 
 removing the unwanted edge by blowing the unwanted edge material from the structured papermaking fabric using air from an air ejection system. 
 
     
     
       2. The method of  claim 1 , wherein the water nozzle is less than about 0.02″ in diameter. 
     
     
       3. A method for trimming an unwanted edge from a moving paper web comprising:
 providing the moving paper web in contact with a structured papermaking fabric; and 
 cutting the unwanted edge from the web when it is on the structured papermaking fabric with one or more water nozzles; 
 wherein the water nozzle is less than about 0.02″ in diameter. 
 
     
     
       4. The method of  claim 3 , wherein the unwanted edge is removed using an air ejection system. 
     
     
       5. The method of  claim 3 , wherein the structured papermaking fabric is a transfer fabric. 
     
     
       6. The method of  claim 3 , wherein the unwanted edge is collected in a trim chute. 
     
     
       7. A method for trimming an unwanted edge from a moving paper web comprising:
 1) making a trim cut in the paper web when it is on a structured papermaking fabric in the drying section of the paper machine with one or more water nozzles; 
 2) removing the unwanted section of edge trim from the fabric before the pressure roll using air from an air ejection system; and 
 3) guiding the excess trim to a Yankee pulper for reprocessing.